I48.0 — Paroxysmal atrial fibrillation

I48.0

ICD-10 Chapter 9: Circulatory System — illustrative image — Chapter 9: Diseases of the circulatory system (I00–I99) — illustrative image

What this code means

Paroxysmal atrial fibrillation is an irregular, often fast heartbeat that starts and stops on its own within days.

Also called: paroxysmal atrial fibrillation, paroxysmal afib.

When this code is used

Used for paroxysmal atrial fibrillation.

Where it sits in ICD-10-CM

Code I48.0 belongs to Chapter 9: Diseases of the circulatory system, which covers codes I00–I99 in the FY2027 ICD-10-CM tabular list. The official description above is copied verbatim from the CDC/NCHS FY2027 code file.

Related symptoms

Related anatomy

Heart

Frequently asked questions

What is ICD-10-CM code I48.0?

I48.0 is the ICD-10-CM diagnosis code for “Paroxysmal atrial fibrillation”. Paroxysmal atrial fibrillation is an irregular, often fast heartbeat that starts and stops on its own within days.

When is code I48.0 used?

Used for paroxysmal atrial fibrillation. It belongs to Chapter 9 of ICD-10-CM (Diseases of the circulatory system).

This guide explains ICD-10-CM codes in plain language for patients, students and other readers. It is educational information only — not coding, billing or medical advice. The code recorded for any real encounter is assigned from the full clinical documentation by the treating team and qualified coders, and only they can decide which code fits a specific case.